A million cubic metres of concrete has now been to build HS2 structures across the West Midlands.

With 1.9 million cubic metres due to be used in total, the milestone signals more than 50% of the required concrete has been used on the 90km stretch.

HS2’s civils contractor Balfour Beatty VINCI (BBV) has three concrete suppliers, keeping their order books full for the foreseeable future, and supporting over 250 jobs.

Aggregate Industries, Tarmac and Cemex have batched and delivered the one million cubic metres of concrete, with the milestone achieved on the Chattle Hill structure at the Delta Junction in North Warwickshire.

There are 11 local batching plants supplying the concrete, five of which are on HS2 sites.

The entire concrete programme in the West Midlands is managed by a dedicated BBV team at HS2’s Kingsbury site near Lea Marston.

The use of low carbon concrete mixes is an integral part of BBV’s concrete supply strategy. High proportions of secondary materials - namely ground granulated blast furnace slag (GGBS) as part of the total cementitious content is embedded into the design and specification for all mixes.

BBV has worked with its supply chain to optimise mixes based on the performance required, maximising the content of GGBS and minimising total cementitious contents to reduce carbon and cost.

The mixes supplied cover a wide range of uses from deep foundations up to 30 metres placed via tremie pipes, large structural elements where the concrete is pumped into place, to the onsite precast factories producing segments for both tunnel lining and the large viaduct spans.

A number of fully electric trucks are being used to transport the concrete to sites, with two of HS2’s batching plants able to run off semi-battery technology, further reducing the project’s carbon footprint.

BBV and its suppliers have also implemented a digital measuring system – VERIFI – which enables real-time monitoring, measurement and management of fresh concrete during transportation. This eliminates waste, cuts carbon and improves productivity.

Jon Knights, materials and durability lead at HS2, said: “The operation to manage the materials needed to build HS2’s structures is hugely complex, so this milestone is a great achievement for the whole team.

“With more than half the concrete poured for structures in the West Midlands, we’re well on the way to completing the viaducts and bridges that will carry the country’s new high-speed railway through the region.”

Chris Jones, senior construction manager at Balfour Beatty VINCI Joint Venture added: “The planning, communication and logistics management needed to achieve this milestone cannot be underestimated.

“Working in partnership with our three concrete suppliers, the team have kept this massive operation moving, supporting delivery of HS2’s construction programme in the region.

“Carbon reduction is a big part of our materials strategy, and we’ve worked closely with our supply chain to minimise the total cementitious contents in order to cut carbon and cost.”

Aggregate Industries are supplying concrete for the Delta Junction structures, where the scale of HS2’s construction programme is now clearly visible.

A network of 13 viaducts is being built over the complex network of motorways, railway lines and rivers in the North Warwickshire area.

The Chattle Hill structure - where the milestone was achieved - will carry four HS2 tracks over the A446 Lichfield Road on the mainline of the railway between London and Handsacre.

The structure is 165m long, 8.3m high and 23m wide. Over 4,100 cubic metres out of a total of around 10,200 cubic metres of concrete have been used for the structure to date.

The A446 diversion to take the road under the new Chattle Hill structure was completed at the end of October 2024, with the second phase of construction set to start. This includes the central reservation piers, northern abutments and decks that will span over the A446.

Tarmac is supplying to the southern end of the route through Warwickshire, along with Washwood Heath and the Curzon approaches viaducts in Birmingham.

Cemex is also providing material in Birmingham, as well as for structures being built in Staffordshire.